UNIT 11 - SOURCES OF ENERGY
I. Put the words in the correct column.
shred splendid spruce splash shrivel
shrub sprout splint sprig splutter
/spr/ /ʃr/ /spl/
II. Complete each sentence with the correct form of the word in brackets.
1. Remember to turn off all the lights before you leave to save (electric)
2. Scientist are searching for fuels, such as the energy of the sun. (alternate)
3. People should conserve resources because once used up, it can never be replaced. (nature)
4 energy is not only plentiful and infinite but also clean and safe. (sun)
5. Farmers add to their land to make it productive. (fertilize)
6. Vehicles are one of the causes of air pollution in big cities. (majority)
7. An important part of conservation is of waste. (prevent)
8. Many people think that the world's resources will never be up. (use)
III. Reduce the relative clauses to participial phrases.
1. I don't like people who arrive late.
2. I live in a house which was built a century ago.
3. The people who work here are very interesting.
4. The handkerchief which was embroidered by my sister was really beautiful.
5. Do you want to meet the man who taught me how to drive?
6. The cake which was made by my mother was very delicious.
7. This morning I received a letter which upset me a lot.
8. The composition which was written by Jane was really interesting.
IV. Rewrite the sentences, using relative clauses.
1. The last person to be interviewed yesterday was Jack.
2. Valetina Tereskova was the first woman to fly into space.
3. The only person to remain in the classroom was Peter.
4. Is there any place for us to stay tonight?
5. This is the second person to be killed in that way.
6. He hasn't got anything to wear.
7. He was the first man to tell me the truth.

examples of extracting work from motion of charge, which is stored beforehand as electromagnetic potential
energy.
In use of (5) energy from an electrical wiring system, or from a chemical battery, the electric
potential energy (6) per amount of electric charge moved (which in turn is given by electric
current multiplied by time), is represented by the electrical potential difference (measured in volts)
(7) the conductors. Thus, when one ampere flows for one second across a potential of one volt,
one joule of energy is made available from the electrical potential. The force which (8) for the work
that is done, is provided to the charge by an electrical field.
The End
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KEY TO TEST 11
I.
/spr/ /ʃr/ / spl /
sprig
sprout
spruce
shred
shrub
shrivel
splint
splash
splendid
splutter
II.
1. electricity 2. alternative 3. natural 4. Solar 5. fertilizers 6. major 7. prevention 8. used
III.
1. I don't like people arriving late.
2. I live in a house built a century ago.
3. The people working here are very interesting.
4. The handkerchief embroidered by my sister was really beautiful.